diff --git a/Maui.DataGrid/DataGrid.xaml.cs b/Maui.DataGrid/DataGrid.xaml.cs
index 64cfeb1..68f1a55 100644
--- a/Maui.DataGrid/DataGrid.xaml.cs
+++ b/Maui.DataGrid/DataGrid.xaml.cs
@@ -1303,6 +1303,7 @@ private void OnColumnsChanged(object? sender, NotifyCollectionChangedEventArgs e
 
     private void OnItemsSourceCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
+        _internalItemsHashSet = null;
         SortAndPaginate();
     }